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1a Getting big, like some pigeons (9)

F - T - - - I N G

3d. One scents old bishop is going to give a harangue (7)

- - O - A - T

I keep thinking of fattening and odorant, but then the letters would clash and I can't really see why the answers would be these either.

MTIA

1. Fathoming (getting)

ie Big (fat) some pigeons (homing)

Many thanks for that chrisg - How clever!
Looks like the other is odorant then, although I don't see why.

odorant is right. Odo (old bish) + rant

Ah - Thanks Jomac!