It's sillier to start draw in a saloon (7)
I believe the answer is:
battier
'it's sillier' is the definition.
I can't tell whether this defines the answer.
'to start draw in a saloon' is the wordplay.
'start' suggests taking the first letters.
'draw' becomes 'tie' (synonyms).
'in' means one lot of letters goes inside another.
'a saloon' becomes 'bar' (synonyms).
The initial letter of 'to' is 't'.
't'+'tie'='ttie'
'ttie' going inside 'bar' is 'BATTIER'.
Can you help me to learn more?
(Another definition for battier that I've seen is " More insane".)