Eccentric Uncle Albert's big character's right for this sort of family (7)
I believe the answer is:
nuclear
'this sort of family' is the definition.
(I've seen this before)
'eccentric uncle albert's big character's right' is the wordplay.
I cannot quite see how this works, but
an anagram of 'uncle' is 'nucle' which is present in the answer.
'right' could be 'ar' (I've seen this in other clues) and 'ar' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for nuclear that I've seen before include "Possessing atomic weapons" , "Type of energy" , "Using atomic energy" , "kind of war" , "Like some physics" .)