Caftan I produced for a keen admirer (7)

I believe the answer is:

fanatic

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'keen admirer' is the definition.
'fanatic' can be an answer for 'admirer' (fanatic is a kind of admirer). I'm not certain of the 'keen' bit.

'caftan i produced' is the wordplay.
'produced' is an anagram indicator.
'caftan'+'i'='caftani'
'caftani' with letters rearranged gives 'FANATIC'.

'for a' is the link.

Can you help me to learn more?

(Other definitions for fanatic that I've seen before include "Extreme enthusiast" , "Narrow-minded enthusiast" , "Extreme zealot" , "One motivated by irrational enthusiasm" , "Zealot or extremist" .)

I've seen this clue in the Evening Standard.

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