Make sense of publicity trick, mostly (3,2)
I believe the answer is:
add up
'make sense' is the definition.
(synonyms)
'publicity trick mostly' is the wordplay.
I cannot quite see how this works, but
'publicity' could be 'ad' (short for advertisement) and 'ad' is found within the answer.
The remaining letters 'dup' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for add up that I've seen before include "Do sums" , "Point to a reasonable conclusion" , "Total; make sense" , "Aggregate, get total" , "Seem consistent or reasonable - arithmetically?" .)
