The lot, some said (3)
I believe the answer is:
sum
'the lot' is the definition.
(thesaurus)
'some said' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'some' sounds like 'SUM'.
(Other definitions for sum that I've seen before include "Add together" , "Arithmetic calculation" , "All one has" , "Arithmetical problem" , "Quantity obtained by addition" .)