Joker's come back extremely kinky. Awkward! (5)

I believe the answer is:

gawky

'awkward' is the definition.
('gawky' can be similar in meaning to 'awkward')

'joker's come back extremely kinky' is the wordplay.
'joker' becomes 'wag' (I've seen this before).
'come back' shows that the letters should be reversed in order.
'extremely' means to remove the middle letters.
'kinky' with its middle removed is 'ky'.
'wag' written backwards gives 'gaw'.
'gaw'+'ky'='GAWKY'

(Another definition for gawky that I've seen is " Awkward and ungainly".)

I've seen this clue in The Independent.

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