Second fisher to take flight (7)
I believe the answer is:
scarper
'flight' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?
'second fisher to take' is the wordplay.
'second' becomes 's' (common abbreviation).
'fisher' becomes 'carpe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to take' becomes 'r' (abbreviation for 'recipe', Latin for 'take').
's'+'carpe'+'r'='SCARPER'
Can you help me to learn more?
(Other definitions for scarper that I've seen before include "Damage" , "bolt" , "Clear off!" , "Run away (colloq.)" , "Escape" .)