All about hiding family dog? (3)
I believe the answer is:
lab
'family dog?' is the definition.
(I've seen this in another clue)
'all about hiding' is the wordplay.
'hiding' indicates the answer is hidden within the clue.
'LAB' is hidden within 'all about'.
(Other definitions for lab that I've seen before include "Science workshop" , "Socialist" , "biology classroom?" , "Place for experiments" , "retriever" .)