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Three to go! All bottom right. If I can get this one, maybe that'll help me with the other two.

25 Regressive delay introducing new vitamin (7)
I have: ----N-L

All hints and help gratefully received.

Vitamin required for visual pigment

In a quick crossword it might be clued as "Vitamin A"

Ha. Got them all now.

Thanks for your help Chris and rh142!

In Wiki both RETINAL and RETINOL are shown as Vitamin A. Both will fit 25a, so how do we decide which one is correct ?

dealy = loiter then reverse it ... retinol

sorry - DELAY not dealy!

Thanks sudo !