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