Crossword Genius

Left avoiding smooth build up (6)

Ross

I believe the answer is:

fatten

'build up' is the definition.
(thesaurus)

'left avoiding smooth' is the wordplay.
'left' becomes 'l' (common abbreviation).
'avoiding' is a deletion indicator.
'smooth' becomes 'flatten' (I've seen this before).
'flatten' with 'l' removed is 'FATTEN'.

(Other definitions for fatten that I've seen before include "Make plump" , "Make chubbier" .)

I've seen this clue in The Sun and The Times.
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