... male snake pursuing meal in street - it puffs out when moving (9)
I believe the answer is:
steamboat
'it puffs out when moving' is the definition.
'male snake pursuing meal in street' is the wordplay.
I cannot really see how this works, but
'male' could be 'm' (common abbreviation) and 'm' is present in the answer.
'snake' could be 'boa' (boa is a kind of snake) and 'boa' is located in the answer.
'meal' could be 'tea' (tea is a kind of meal) and 'tea' is located in the answer.
'street' could be 'st' and 'st' is located in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
(Other definitions for steamboat that I've seen before include "packet" , "Vessel powered by water vapour" , "Mississippi craft" , "-- Willie, early Mickey Mouse film" .)