What is long and yellow with no tail? (5)
I believe the answer is:
crave
'what is long' is the definition.
(crave can mean to long for)
'yellow with no tail?' is the wordplay.
'yellow' becomes 'craven' (I've seen this before).
'with no tail?' means to remove the last letter (I've seen 'with no tail' mean this).
'craven' with its final letter taken away is 'CRAVE'.
'and' is the link.
(Other definitions for crave that I've seen before include "Beseech" , "Have strong urge" , "Really want" , "Pine" , "Desperately desire" .)