Both sides in Salisbury getting agreement for clerical gathering (5)
I believe the answer is:
synod
'clerical gathering' is the definition.
(I've seen this in another clue)
'both sides in salisbury getting agreement' is the wordplay.
'both sides in' means to remove the middle letters (only the side letters remain).
'getting' means one lot of letters go next to another.
'agreement' becomes 'nod' (a nod indicates agreement).
'salisbury' with its middle removed is 'sy'.
'sy'+'nod'='SYNOD'
'for' acts as a link.
(Other definitions for synod that I've seen before include "Ecumenical council" , "Church council" , "Forum for discussing" , "Council of bishops" , "Council of clergy to discuss policy" .)