Crossword Genius

Fix everything in a helmet (6)

Ross

I believe the answer is:

sallet

'a helmet' is the definition.
(sallet is a kind of helmet)

'fix everything in' is the wordplay.
'fix' becomes 'set' (synonyms).
'everything' becomes 'all' (I've seen this before).
'in' indicates putting letters inside.
'set' placed around 'all' is 'SALLET'.

I've seen this clue in The Hindu.
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