Kid has no time to relax (4)
I believe the answer is:
ease
'relax' is the definition.
(I've seen this before)
'kid has no time' is the wordplay.
'kid' becomes 'tease' (I've seen this before).
'has no' suggests deleting specific letters.
'time' becomes 't'.
'tease' with 't' taken away is 'EASE'.
'to' is the link.
(Other definitions for ease that I've seen before include "Freedom from worry" , "Poise or leisure" , "Soothe" , "Freedom from hardship" , "Absence of hardship" .)