Shy having to spill beans about Liberal (5)
I believe the answer is:
sling
'shy' is the definition.
(I've seen this before)
'to spill beans about liberal' is the wordplay.
'to spill beans' becomes 'sing' (both can mean to reveal a secret).
'about' means one lot of letters goes inside another.
'liberal' becomes 'l' (abbreviation).
'sing' placed around 'l' is 'SLING'.
'having' is the link.
(Other definitions for sling that I've seen before include "Bandage support; hurl" , "Cast - used for injured arm" , "Throw, fling" , "American drink" , "Sweetened drink with spirit base" .)