Use retail complex when relaxing (2,7)

I believe the answer is:

at leisure

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'relaxing' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'use retail complex' is the wordplay.
'complex' is an anagram indicator.
'use'+'retail'='useretail'
'useretail' is an anagram of 'AT LEISURE'.

'when' is the link.

Can you help me to learn more?

(Other definitions for at leisure that I've seen before include "In an unhurried manner" , "No hurry, having a rest" , "With time to spare" , "resting" , "free" .)

I've seen this clue in The Irish Times.

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