Feeling, fraction before intuition (5,5)
I believe the answer is:
sixth sense
'intuition' is the definition.
(sixth sense is a kind of intuition)
'feeling fraction before' is the wordplay.
'feeling' becomes 'sense' (I've seen this before).
'fraction' becomes 'sixth' (sixth is a kind of fraction).
'before' says to put letters next to each other.
'sense' after 'sixth' is 'SIXTH SENSE'.
(Other definitions for sixth sense that I've seen before include "Inexplicable instinct" , "Intuitive faculty" , "ESP" , "Ability to perceive by intuition, clairvoyance etc" , "Intuition perhaps" .)