I wondered about feathers (9)

I believe the answer is:

eiderdown

'feathers' is the definition.
(eiderdown is a kind of feathers)

'i wondered about' is the wordplay.
'about' indicates anagramming the letters.
'i'+'wondered'='iwondered'
'iwondered' is an anagram of 'EIDERDOWN'.

(Other definitions for eiderdown that I've seen before include "What might keep one warm" , "cover when retired" , "Soft quilt filled with duck feathers" , "what keeps retired people warm" , "I wondered about this warm bed covering" .)

I've seen this clue in The Times.

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