Live television to start with gamble (3)
I believe the answer is:
bet
'gamble' is the definition.
(betting is a kind of gambling)
'live television to start' is the wordplay.
'live' becomes 'be' (synonyms).
'to start' indicates taking the first letters.
The first letter of 'television' is 't'.
'be'+'t'='BET'
'with' is the link.
(Other definitions for bet that I've seen before include "22 across will accept one" , "Speculation" , "Wager, speculate" , "'Stake, wager (3)'" , "Wager, or the sum waged" .)