Family with arms factories runs under a thousand to increase power (5)

'family with arms factories' is the definition.
I can't judge whether this defines the answer.

'runs under a thousand to increase power' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'under' says to put letters next to each other (in a down clue, some letters go below others).
'a thousand' becomes 'K' (K can mean thousand, e.g. u0k).
'to increase' becomes 'up' (upping is a kind of increasing).
'power' becomes 'p' (symbol in physics).
'r' put after 'k' is 'kr'.
'kr'+'up'+'p'='KRUPP'

Can you help me to learn more?