Mobile phone ring right for loser (2-5)
I believe the answer is:
no-hoper
'loser' is the definition.
(I've seen this before)
'mobile phone ring right' is the wordplay.
'mobile' indicates anagramming the letters.
'ring' becomes 'o'.
'right' becomes 'r' (common abbreviation).
'phone'+'o'='phoneo'
'phoneo' with letters rearranged gives 'nohope'.
'nohope'+'r'='NO-HOPER'
'for' acts as a link.
(Other definitions for no-hoper that I've seen before include "definite loser" , "One has nil chance of success" , "One unlikely to succeed" , "Lost cause" , "Person not expected to be successful" .)