It's only my reel that's become twisted (6)

I believe the answer is:

merely

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'it's only' is the definition.
(merely can mean only or simply)

'my reel that's become twisted' is the wordplay.
'my reel' can be anagrammed to 'MERELY'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for merely that I've seen before include "'Only, and nothing more (6)'" , "Just one" , "Simply - only" .)

I've seen this clue in The Irish Independent.

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