Stamp letters - you'll find plenty inside (5)

I believe the answer is:

ample

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'stamp letters you'll find plenty inside' is the definition.
I can't tell whether this defines the answer.

'stamp letters you'll find' is the wordplay.
'find' says the answer is hidden in the clue (I've seen 'found' mean this).
'AMPLE' is hidden within 'stamp letters youll'.

Can you help me to learn more?

(Other definitions for ample that I've seen before include "Bulky" , "Large enough" , "Big" , "Copious - abundant" , "Adequate" .)

I've seen this clue in The Irish Independent.

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