27D notebook (3)
I believe the answer is:
pad
'notebook' is the definition.
(thesaurus)
'27d' is the wordplay.
I cannot really see how this works, but
'27d' could be 'd' and 'd' is found in the answer.
The remaining letters 'pa' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pad that I've seen before include "Tread softly" , "Protective guard; home" , "pack" , "Absorbent material" , "Sole" .)