Noise? There's plenty around the Nag's Head! (5)
I believe the answer is:
bangs
'noise? there's' is the definition.
I can't tell whether this definition defines the answer.
'plenty around the nag's head' is the wordplay.
'plenty' becomes 'bags' (I've seen this before).
'around' means one lot of letters goes inside another.
'the nag's head' becomes 'n' (I can't explain this - if you can you should give a lot more credence to this answer).
'bags' going around 'n' is 'BANGS'.
Can you help me to learn more?
(Another definition for bangs that I've seen is " Explosions to be found in hair on the forehead".)