Grotesque Gorgon's head, not a thing seen in Plymouth? (8)
I believe the answer is:
gargoyle
'grotesque' is the definition.
(I've seen this in another clue)
'gorgon's head not a thing seen in plymouth?' is the wordplay.
'head' indicates taking the first letters.
'not a thing' becomes 'o' (I've seen this in other clues).
'seen in' indicates putting letters inside.
'plymouth?' becomes 'argyle' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'gorgons' is 'g'.
'o' going inside 'argyle' is 'argoyle'.
'g'+'argoyle'='GARGOYLE'
Can you help me to learn more?
(Other definitions for gargoyle that I've seen before include "Grotesquely carved waterspout" , "It drains off water" , "Grotesque face of the gutter" , "Grotesque rain spout" , "Grotesque carved figure as ancient water-spout" .)