Crossword Genius

Bird needing second mudbath? (7)

Ross

I believe the answer is:

swallow

I'm a little stuck... Click here to teach me more about this clue!

'bird' is the definition.
(I know that swallow is a type of oscine)

'second mudbath?' is the wordplay.
I cannot really understand how this works, but
'second' could be 's' (common abbreviation) and 's' is found within the answer.
The remaining letters 'wallow' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'needing' is the link.

Can you help me to learn more?

(Other definitions for swallow that I've seen before include "Fall for; bird" , "Fork-tailed bird" , "Eat or drink" , "Bird - drink" , "Get down" .)

I've seen this clue in The Times.
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