Spots son lacking resistance getting weak (8)
I believe the answer is:
feckless
'weak' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'spots son lacking resistance' is the wordplay.
'spots' becomes 'freckles' (freckle is a kind of spot).
'son' becomes 's' (genealogical abbreviation for son).
'lacking' indicates named letters should be taken away.
'resistance' becomes 'r' (electronics abbreviation).
'freckles'+'s'='freckless'
'freckless' with 'r' taken out is 'FECKLESS'.
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for feckless that I've seen before include "Not fit for responsibility" , "Feeble - ineffectual" , "Helpless or irresponsible" , "Good-for-nothing" , "Lacking strength of character, irresponsible" .)