As a general rule I would recommend providing the clue number/direction, the clue itself, the number of letters in the solution (known in smart circles as the 'enumeration') and the crossing letters in the grid (aka 'checkers') that you have, eg
1a As an instance (3,7) F?R ?X?M?L?
If you only want a hint it is best to say so as some responders will by default give you the solution.