A fair amount of drugs for heart problems or various conditions (7)
I believe the answer is:
weather
'conditions' is the definition.
(I've seen this before)
'a fair amount of drugs for heart' is the wordplay.
'a fair amount' becomes 'w' (W is an example. I am not sure about the 'fair' bit.).
'of' indicates an anagram (the answer comes from or 'of' the letters).
'drugs' becomes 'E' (somebody 'on E' could also be 'on drugs').
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'e' after 'heart' is 'hearte'.
'hearte' anagrammed gives 'eather'.
'w'+'eather'='WEATHER'
'problems or various' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for weather that I've seen before include "Endure" , "Local atmospheric conditions" , "Survive (ordeal); be worn away naturally" , "Withstand" , "Come safely through; erode" .)