Crossword Genius

Subs turning to a sub (1-5)

Ross

I believe the answer is:

u-boats

'subs' is the definition.
('U-boat' can be a synonym of 'sub')

'turning to a sub' is the wordplay.
'turning' indicates an anagram.
'to'+'a'+'sub'='toasub'
'toasub' anagrammed gives 'U-BOATS'.

(Other definitions for u-boats that I've seen before include "Submersible warships" , "German subs" , "German submarines in WW2" , "German submarines of second World War" , "Submersible ships of WW2" .)

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