Crossword Genius

Needed if it’s cool when we take a rest break outside (7)

Ross

I believe the answer is:

sweater

I'm a little stuck... Click here to teach me more about this clue!

'needed if it's cool' is the definition.
I can't tell whether this defines the answer.

'we take a rest break outside' is the wordplay.
'take' is a charade indicator (letters next to each other).
'break' indicates an anagram.
'outside' indicates putting letters inside.
'rest' anagrammed gives 'ster'.
'we'+'a'='wea'
'wea' going within 'ster' is 'SWEATER'.

'when' is the link.

Can you help me to learn more?

(Other definitions for sweater that I've seen before include "Heavy jersey" , "Wear" , "Top" , "Jumper (7)" , "Re waste: it's a garment" .)

I've seen this clue in the Evening Standard.
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