Crossword Genius

Fix on and turn off underwater explosive (9)

Ross

I believe the answer is:

determine

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This could be a double definition.

'fix on' is the first definition.
(thesaurus)

'turn off underwater explosive' is the second definition.
'determine' can be an answer for 'turn' (thesaurus). I'm not certain of the 'off underwater explosive' bit.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for determine that I've seen before include "Firmly decide" , "Ascertain by research or calculation" , "Come to a decision" , "Decide - to settle" , "Dictate" .)

I've seen this clue in the Sydney Morning Herald.
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