He did imitations and made a pile (6)
I believe the answer is:
heaped
'made a pile' is the definition.
(I've seen this before)
'he did imitations' is the wordplay.
'did imitations' becomes 'aped' (I've seen this in another clue).
'he'+'aped'='HEAPED'
'and' acts as a link.
(Other definitions for heaped that I've seen before include "Piled, stacked" , "Fully laden" , "made a pile" .)