Crossword Genius

Jack has to hit the mark (6)

Ross

I believe the answer is:

target

'the mark' is the definition.
('target' can be a synonym of 'mark')

'jack has to hit' is the wordplay.
'jack' becomes 'tar' (I've seen this before).
'has' is a charade indicator (letters next to each other).
'to hit' becomes 'get' (getting is a kind of hitting**).
'tar'+'get'='TARGET'

(Other definitions for target that I've seen before include "Object of attack" , "Point to be aimed at" , "A result to aim at" , "Something to aim for" , "Goal, objective" .)

I've seen this clue in the Evening Standard.
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