Mournful English cricket side, by one account (7)
I believe the answer is:
elegiac
'mournful' is the definition.
(synonym)
'english cricket side by one account' is the wordplay.
'english' becomes 'e' (abbreviation).
'cricket side' becomes 'leg' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'account' becomes 'ac'.
'e'+'leg'+'i'+'ac'='ELEGIAC'
(Other definitions for elegiac that I've seen before include "Expressing poetic sorrow for something past" , "Wistful, mournful" , "Mournful, lamenting" , "of valedictory works" , "Like classical couplets" .)