Tear wrapping from éclair that’s readier to eat (5)
I believe the answer is:
riper
'readier to eat' is the definition.
'tear wrapping from eclair' is the wordplay.
'tear' becomes 'rip' (ripping is a kind of tearing).
'wrapping from' means to remove the middle letters (the outside letters or wrapper of the word remain).
'eclair' with its centre removed is 'er'.
'rip'+'er'='RIPER'
'that's' acts as a link.
(Other definitions for riper that I've seen before include "More ready to pick" , "More suitable for picking" , "More ready for harvest" , "becomes more mature" , "More ready for picking" .)