Tool for nailing shellfish containing white meat on either ends

'tool' is the definition.
(claw hammer is a kind of tool)

'shellfish containing white meat on either ends' is the wordplay.
'shellfish' becomes 'clam' (clam is a kind of shellfish).
'containing' indicates putting letters inside.
'white meat on' becomes 'wham' (I can't justify this - if you can you should give a lot more credence to this answer).
'ends' says to hollow out the word (remove centre letters).
'either' with its centre removed is 'er'.
'clam' placed around 'wham' is 'clawhamm'.
'clawhamm'+'er'='CLAW-HAMMER'

'for nailing' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?