Seaman Mark to leave booze alone (7)

I believe the answer is:

abstain

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'leave booze alone' is the definition.
I can't judge whether this definition defines the answer.

'seaman mark' is the wordplay.
'seaman' becomes 'ab' (short for able seaman).
'mark' becomes 'stain' (synonyms).
'ab'+'stain'='ABSTAIN'

'to' acts as a link.

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(Other definitions for abstain that I've seen before include "Formally decline to vote" , "Pass" , "Resist" , "Refuse to vote" , "Choose not to consume" .)

I've seen this clue in The Sun.

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