Crossword Genius

Oak apples, for instance, contain the lot (5)

Ross

I believe the answer is:

galls

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'oak apples' is the definition.
The definition and answer can be both plants as well as being plural nouns.
Maybe there's an association between them I don't understand?

'instance contain the lot' is the wordplay.
'instance' becomes 'gs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'contain' means one lot of letters goes inside another.
'the lot' becomes 'all' (I've seen this before).
'gs' going around 'all' is 'GALLS'.

'for' acts as a link.

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I've seen this clue in the Evening Standard.
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