Reasonable to be under pressure to damage a business dealing with drugs (15)

'dealing with drugs' is the definition.
I can't judge whether this defines the answer.

'reasonable to be under pressure to damage a business' is the wordplay.
I cannot really understand how this works, but
'reasonable' could be 'logical' (associated in meaning) and 'logical' is found in the answer.
'pressure' could be 'p' (scientific abbreviation) and 'p' is found in the answer.
'damage' could be 'harm' (synonyms) and 'harm' is located in the answer.
'a' is present in the answer.
'business' could be 'co' (short for company) and 'co' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?