Singular fact: England making up for United’s power (8)
I believe the answer is:
strength
'power' is the definition.
(strength is a kind of power)
'singular fact england making up for united's' is the wordplay.
I cannot quite see how this works, but
'singular' could be 's' (abbreviation sometimes used in dictionaries) and 's' is found in the answer.
'england' could be 'eng' and 'eng' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for strength that I've seen before include "Force, might, potency" , "Vigour, potency" , "stamina" , "Beneficial attribute" , "Toughness, force" .)