Who'd bend press release involving press? (5)
I believe the answer is:
plier
'who'd bend' is the definition.
The definition suggests a singular noun which matches the answer.
'press release involving press?' is the wordplay.
'press release' becomes 'pr' (public relations).
'involving' means one lot of letters goes inside another.
'press?' becomes 'lie' (I can't explain this - if you can you should give a lot more credence to this answer).
'pr' enclosing 'lie' is 'PLIER'.
Can you help me to learn more?
(Another definition for plier that I've seen is " Worker".)