Tiny creature to escape we hear (4)
I believe the answer is:
flea
'tiny creature' is the definition.
(fleas are very small insects)
'escape we hear' is the wordplay.
'escape' becomes 'flee' (I've seen this before).
'we hear' indicates a 'sounds like' (homophone) clue.
'flee' is a homophone of 'FLEA'.
'to' acts as a link.
(Other definitions for flea that I've seen before include "high-jumper" , "Circus insect?" , "Small blood-sucking insect" , "Jumping parasite" , "Leaping insects" .)