Computer programs to do some running battle in London area (9)
I believe the answer is:
shareware
'computer programs' is the definition.
(I've seen this before)
'do some running battle in london area' is the wordplay.
'do some running' becomes 'hare' (hare can mean to run fast).
'battle' becomes 'war' (I've seen this before).
'in' is an insertion indicator.
'london area' becomes 'SE' (abbreviation for South East).
'hare'+'war'='harewar'
'harewar' going into 'se' is 'SHAREWARE'.
'to' acts as a link.
(Other definitions for shareware that I've seen before include "Free computer programs" , "Computer programmes made widely available" , "Computer programmes made freely available" .)