The widow who urges one to take a gamble (7)
I believe the answer is:
dowager
'the widow who urges' is the definition.
'dowager' can be an answer for 'the widow' (term for an aristocratic widow). I'm unsure of the remainder of the definition.
'one to take a gamble' is the wordplay.
'one to take' becomes 'do' (eg taking or doing drugs).
'a gamble' becomes 'wager' (wager is a kind of gamble).
'do'+'wager'='DOWAGER'
Can you help me to learn more?
(Other definitions for dowager that I've seen before include "Widow with inheritance" , "Important widow" , "Woman who holds title from dead husband" , "Rich old girl" , "Dignified (or wealthy) elderly woman" .)