Play drums to deer - it's excellent value! (4,3,4,4)

'excellent value' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'play drums to deer' is the wordplay.
I cannot quite understand how this works, but
'to' could be 'for' and 'for' is found within the answer.
'deer' could be 'buck' (male deer) and 'buck' is found in the answer.
This explanation may well be incorrect...

'it's' is the link.

Can you help me to learn more?