In speech I'd name an egg-laying mammal (7)

I believe the answer is:

echidna

'an egg-laying mammal' is the definition.
(echidna is a kind of egg-laying mammal)

'in speech i'd name' is the wordplay.
'in' says the answer is hidden in the clue.
'ECHIDNA' can be found hidden inside 'speech id name'.

(Other definitions for echidna that I've seen before include "Little animal" , "Spiny egg-laying Australian mammal" , "Insectivorous mammal" , "This insectivore" , "Toothless type" .)

I've seen this clue in The Guardian.

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