Laid-back Corinthian's teammate? (6)

I believe the answer is:

casual

I believe this clue is a double definition.

'laid-back' is the first definition.
(laid-back can mean casual or relaxed)

'corinthian's teammate?' is the second definition.
(Corinthian-Casuals FC is a football club)

(Other definitions for casual that I've seen before include "Informal, not methodical" , "Insouciant" , "Occasional worker" , "Careless, without serious commitment" , "Informal or not showing any enthusiasm" .)

I've seen this clue in The Guardian.

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