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Help needed on 4 please

No 2. Chocolate biros (8)
No 20. Exaggeration or invented detail (10)
No 27. If you insert an 'e' your iron is too hot (7)
No 29. An MP and his doctor trying to influence public opinion (8)

I will have a stab at a couple:

aerobics

singing (insert an e to produce singeing).

got the answers to the first three just need No 29 now - any help will be gratefully received