Finding gift that's absolutely right makes one tense (7,7)
I believe the answer is:
present perfect
'one tense' is the definition.
(present perfect is a kind of tense)
'finding gift that's absolutely right' is the wordplay.
'finding gift' becomes 'present' (I can't justify this - if you can you should give a lot more credence to this answer).
'that's absolutely right' becomes 'perfect'.
'present'+'perfect'='PRESENT PERFECT'
'makes' is the link.
(Other definitions for present perfect that I've seen before include "Tense" , "I have left in this?" , "writing the briefest of thank you letters?" , "giver is happy to hear this?" .)