Crossword Genius

To put, perhaps , or add (3,2)

Ross

I believe the answer is:

tot up

'add' is the definition.
('tot up' can be a synonym of 'add')

'to put perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'put' is an anagram of 'tup'.
'to'+'tup'='TOT UP'

'or' is the link.

(Other definitions for tot up that I've seen before include "Sum - total" , "Count" , "Reckon" , "Determine the sum of" , "Summate" .)

I've seen this clue in the Evening Standard.
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