Kid to make relay race a bit shorter? (4,8,3)
I believe the answer is:
pull someones leg
'kid' is the definition.
(I've seen this before)
'relay race a bit shorter?' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is found within the answer.
'bit' could be 'o' (resembles 0, a binary digit or bit) and 'o' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'to make' is the link.
(Other definitions for pull someones leg that I've seen before include "make member of relay team redundant?" , "Kid" .)