Winged fruit remains crucial (3-3)

I believe the answer is:

ash-key

I'm a little stuck... Click here to teach me more about this clue!

'winged fruit' is the definition.
'ash-key' can be an answer for 'fruit' (ash-key is a kind of fruit). I am unsure of the 'winged' bit.

'remains crucial' is the wordplay.
'remains' becomes 'ash' (remains of a fire).
'crucial' becomes 'key' (I've seen this before).
'ash'+'key'='ASH-KEY'

Can you help me to learn more?

I've seen this clue in The Guardian.

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