She's about to have been to grog shops (8)
I believe the answer is:
shebeens
'shops' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.
'she's about to have been to grog' is the wordplay.
'about' indicates an anagram.
'to have' is an insertion indicator.
'to' says to put letters next to each other (I've seen this in other clues).
'grog' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'she' with letters rearranged gives 'hes'.
'hes' going around 'been' is 'hebeens'.
'hebeens' put after 's' is 'SHEBEENS'.
Can you help me to learn more?
(Other definitions for shebeens that I've seen before include "Unlicensed drinking establishments" , "Unlicensed taverns" .)