Site for watching matches live not available (5)
I believe the answer is:
arena
'site' is the definition.
(thesaurus)
'live not available' is the wordplay.
'live' becomes 'are' ('they live' means 'they are').
'not available' becomes 'na' (abbreviation).
'are'+'na'='ARENA'
'for watching matches' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for arena that I've seen before include "Enclosure for sports etc." , "centre of conflict" , "dramatic situation" , "Wembley, say" , "Earls Court?" .)