Crossword Genius

Removal of U-boat drawing (11)

Ross

I believe the answer is:

subtraction

'removal' is the definition.
(thesaurus)

'u-boat drawing' is the wordplay.
'u-boat' becomes 'sub' (synonyms).
'drawing' becomes 'traction' (I've seen this before).
'sub'+'traction'='SUBTRACTION'

'of' is the link.

(Another definition for subtraction that I've seen is " Calculation -- or tacit snub (anag)".)

I've seen this clue in The Times.
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