Looking very pale, the lady needs treatment (7)
I believe the answer is:
deathly
'looking very pale' is the definition.
'deathly' can be an answer for 'pale' (thesaurus). I am not certain of the 'looking very' bit.
'the lady needs treatment' is the wordplay.
'needs treatment' indicates an anagram (letters must be processed or treated).
'the'+'lady'='thelady'
'thelady' with letters rearranged gives 'DEATHLY'.
Can you help me to learn more?
(Other definitions for deathly that I've seen before include "Cadaverous" , "Extremely pale" .)