Crossword Genius

Pick ace out; it may relieve tension (3,4)

Ross

I believe the answer is:

ice pack

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'it may relieve tension' is the definition.
The definition suggests a singular noun which matches the answer.

'pick ace out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'pick'+'ace'='pickace'
'pickace' is an anagram of 'ICE-PACK'.

Can you help me to learn more?

(Other definitions for ice pack that I've seen before include "It's applied to cool or reduce swelling" , "Cold item held against a swollen body part" , "This could reduce swelling" , "polar region" , "Cold bag for e.g. swelling" .)

I've seen this clue in The Globe and Mail.
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