Stand deep in pitch, say (4)
I believe the answer is:
base
'stand deep' is the definition.
'base' can be an answer for 'stand' (thesaurus). I am unsure of the 'deep' bit.
'pitch say' is the wordplay.
'pitch' becomes 'bass' (bass is a kind of pitch).
'say' indicates a 'sounds like' (homophone) clue.
'bass' sounds like 'BASE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for base that I've seen before include "Shameful - headquarters" , "centre from which soldiers operate" , "Not worth much" , "Reprobate" , "This underlying structure" .)