A few variables, and it might be assumed by some that the pilot will take the shortest turn.
However reversing a turn in an orbit to roll out on a specified heading does not always make sense. For ease of flying, passenger comfort etc, the crew may well elect to continue the turn until the specified heading, even if it is the long way round.
In a published hold, it would be fair to assume that the pilot will continue to turn in the published direction of the hold.
However, these are assumptions... if you are in any doubt why not use specific phraseology?
In a hold with a specified datum "Hold cancelled, leave XXX (datum) heading xxx degrees" - aircraft will continue in the same direction
In an orbit you could use 'Continue right/left turn onto heading xxx degrees"
In both of the above, you and the pilot are in no doubt as to what way you want them to turn.
If you want them to reverse the turn onto a heading, use "turn left/right heading xxx degrees" - you could even prefix it with "Stop turn/orbit...".
Bear in mind that unless you have a very good reason for wanting to reverse the turn, the chances are the pilot would rather continue in the original direction.
By the time the turn has been stopped and reversed, it will take almost as long to get to your heading, it will take up more airspace, and the exit point will be less predictable.
Maybe not 100% ICAO standard phraseology, but it is unambiguous.