A whole lot, you gather (5)

I believe the answer is:

amass

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

'you gather' is the definition.
'amass' can be an answer for 'gather' (amass can mean to collect or gather). I'm unsure of the 'you' bit.

'a whole lot' is the wordplay.
'whole lot' becomes 'mass' (synonyms).
'a'+'mass'='AMASS'

Can you help me to learn more?

(Other definitions for amass that I've seen before include "Collect, hoard" , "Be a compiler" , "Stockpile" , "Stock up on" , "Sodium chloride" .)

I've seen this clue in the Evening Standard.

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