Again hear about score at Twickenham? (5)
I believe the answer is:
retry
'again hear' is the definition.
(as in to try or hear a legal case again)
'about score at twickenham?' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'score at twickenham?' becomes 'try' (a rugby try might be scored at Twickenham Stadium).
're'+'try'='RETRY'
(Other definitions for retry that I've seen before include "Have another go" , "Make a further attempt" , "Put on trial again" , "Hear (a case) again" , "take second opinion on case" .)