Outing fled inside for a stiff drink (6)
I believe the answer is:
triple
'a stiff drink' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'outing fled inside' is the wordplay.
'outing' becomes 'trip' (I've seen this before).
'inside' means to look at the middle letters.
The middle of 'fled' is 'le'.
'trip'+'le'='TRIPLE'
'for' is the link.
Can you help me to learn more?
(Other definitions for triple that I've seen before include "make score sixty?" , "Three times" , "Threefold, treble" , "In three parts" , "Increase threefold" .)