Crossword Genius

Kid a fellow, that's all (5)

Ross

I believe the answer is:

total

'all' is the definition.
(thesaurus)

'kid a fellow' is the wordplay.
'kid' becomes 'tot' (tot is a kind of kid).
'a fellow' becomes 'al' (I've seen this in other clues).
'tot'+'al'='TOTAL'

'that's' is the link.

(Other definitions for total that I've seen before include "Entire sum" , "Whole amount" , "Complete sum" , "Final tally" , "Complete; add up" .)

I've seen this clue in the Evening Standard.
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