Crossword Genius

The mark Jack has to achieve (6)

Ross

I believe the answer is:

target

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

'jack has to achieve' is the wordplay.
'jack' becomes 'tar' (both are informal terms for sailor).
'has' is a charade indicator (letters next to each other).
'to achieve' becomes 'get' (I've seen this in another clue).
'tar'+'get'='TARGET'

(Other definitions for target that I've seen before include "Aim, ambition" , "bull's eye" , "Aim of an attack" , "aunt Sally" , "A result to aim at" .)

I've seen this clue in the Evening Standard.
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