Gives out tips on economical fuel (6)
I believe the answer is:
diesel
'fuel' is the definition.
(diesel fuel is a kind of fuel)
'gives out tips on economical' is the wordplay.
'gives out' becomes 'dies' ('die' can be a synonym of 'give out').
'tips on' says to hollow out the word (remove centre letters) (only the tips of the word).
'economical' with its middle removed is 'el'.
'dies'+'el'='DIESEL'
(Other definitions for diesel that I've seen before include "See lid for the engine" , "Vehicle fuel" , "Type of fuel oil" , "Rudolf __ , French-born German engine inventor, d.1913" , "Train perhaps" .)