Cloth, weak type - angler's bait? (7)
I believe the answer is:
ragworm
'type angler's bait?' is the definition.
The definition suggests a singular noun which matches the answer.
'cloth weak' is the wordplay.
'cloth' becomes 'rag' (rag is a kind of cloth).
'weak' becomes 'worm' (I can't justify this - if you can you should give a lot more credence to this answer).
'rag'+'worm'='RAGWORM'
Can you help me to learn more?
(Another definition for ragworm that I've seen is " Creature often used as fishing bait".)