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I'm struggling with two:

24a Discount brand not working (4,4) M??? D?W?

21d Fish on line? It can need a lot of lifting (3-4) B??-?E??

The third letter of each answer is common, and whilst I have a few ideas of my own, any help would be much appreciated.

24 mark down

21 big deal

http://britishseafishing.co.uk/dealfish/

Unfortunately, the third letter of each answer is common, so both suggestions cannot be correct.

Any further ideas please?

21d Bar bell?
A barbel is a fish

Well done Mattrom.
I thought I'd nailed it but, unfortunately, in my haste, missed the preamble

Brilliant, many thanks to you both for your assistance.