Crossword Genius

Mushroom in group coming up (3-3)

Ross

I believe the answer is:

ink-cap

'mushroom' is the definition.
(I've seen this before)

'in group coming up' is the wordplay.
'group' becomes 'pack' (pack can mean a group of things).
'coming up' says the letters should be written in reverse (in a down clue, letters go up).
'pack' back-to-front is 'kcap'.
'in'+'kcap'='INK-CAP'

(Another definition for ink-cap that I've seen is " Type of mushroom".)

I've seen this clue in The Independent.
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