Local installation always needing power during strike (4,4)
I believe the answer is:
beer pump
'local installation' is the definition.
The definition suggests a singular noun which matches the answer.
'always needing power during strike' is the wordplay.
'always' becomes 'eer' (poetic way of saying ever).
'needing' is a charade indicator (letters next to each other).
'power' becomes 'p' (symbol in physics).
'during' indicates putting letters inside.
'strike' becomes 'bump' (bumping is a kind of striking).
'eer'+'p'='eerp'
'eerp' inserted into 'bump' is 'BEER-PUMP'.
Can you help me to learn more?
(Other definitions for beer pump that I've seen before include "one used to draw in locals" , "held in pub" .)