Check your lines in advance for catches in lough (8)
I believe the answer is:
rehearse
'check your lines in advance' is the definition.
I can't tell whether this definition defines the answer.
'catches in lough' is the wordplay.
'catches' becomes 'hears'.
'in' indicates putting letters inside.
'lough' becomes 'ree' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hears' put into 'ree' is 'REHEARSE'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for rehearse that I've seen before include "Practice a play" , "prepare for performance" , "Practise like actor" , "Go over" , "What actor does to prepare for play" .)