Bloke picked up claim to find a lot of correspondence (7)
I believe the answer is:
mailbag
'correspondence' is the definition.
(I've seen this before)
'bloke picked up claim' is the wordplay.
'bloke' becomes 'liam' (I am not sure about this - if you are sure you should believe this answer much more).
'picked up' is a reversal indicator.
'claim' becomes 'bag' (I've seen this before).
'liam' back-to-front is 'mail'.
'mail'+'bag'='MAILBAG'
'to find a lot of' acts as a 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?
(Other definitions for mailbag that I've seen before include "Post pouch" , "Postal sack" , "Sent down sewer's product" , "One sewn by convicts" , "carrier" .)