Approach tailless urban feline from behind (6)
I believe the answer is:
tactic
'approach' is the definition.
'tailless urban feline from behind' is the wordplay.
'tailless' means to remove the last letter.
'urban' becomes 'city'.
'feline' becomes 'cat' (I've seen this before**).
'from behind' shows that the letters should be reversed in order.
'city' with its final letter taken off is 'cit'.
'cit'+'cat'='citcat'
'citcat' reversed gives 'TACTIC'.
(Other definitions for tactic that I've seen before include "Manoeuvre, stratagem" , "Action designed to achieve a specific end" , "Device" , "element of strategy" , "A skilful manoeuvre or procedure" .)