Awful deep (7)
I believe the answer is:
abysmal
This clue is a double definition.
'awful' is the first definition.
(I've seen this before)
'deep' is the second definition.
('abysmal' can be similar in meaning to 'deep')
(Other definitions for abysmal that I've seen before include "Deep, immeasurable" , "Really terrible" , "Very deep or bad" , "Extremely bad, appalling" , "Unfathomable - extremely bad" .)