Cheer try before catch is reviewed (7)
I believe the answer is:
hearten
'cheer' is the definition.
(synonyms)
'try before catch is reviewed' is the wordplay.
'try' becomes 'hear' (as in to try someone in court or hear their case).
'before' says to put letters next to each other.
'catch' becomes 'net' (netting is a kind of catching).
'is reviewed' is a reversal indicator.
'net' written backwards gives 'ten'.
'hear'+'ten'='HEARTEN'
(Other definitions for hearten that I've seen before include "Comfort" , "giving cheer" , "Encourage in Teheran" , "Encourage or cheer in cardiac manner" , "Buoy" .)