Dad confused about tot (3)
I believe the answer is:
add
'tot' is the definition.
(I've seen this before)
'dad confused' is the wordplay.
'confused' indicates anagramming the letters.
'dad' with letters rearranged gives 'ADD'.
'about' is the link.
(Other definitions for add that I've seen before include "put two and two together" , "Contribute" , "Give more" , "Reason for difficulty learning" , "Augment" .)