Remember about part of string section brought up in court (9)
I believe the answer is:
recollect
'remember' is the definition.
(synonyms)
'about part of string section brought up in court' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'part of string section' becomes 'cello'.
'brought up' says the letters should be written in reverse (down clues only).
'in' means one lot of letters goes inside another.
'court' becomes 'ct' (abbreviation used in road names).
'cello' backwards is 'ollec'.
'ollec' placed inside 'ct' is 'collect'.
're'+'collect'='RECOLLECT'
(Other definitions for recollect that I've seen before include "in Scotland, mind" , "Recall to mind" , "Bring back to mind." , "Remember" , "Flock together again" .)