The Crossword Centre Clue-Writing Competition

CCCWC June competition voters’ comments
 
Clue no. 40: Non-smoker pens letter to hold pulmonologist responsible primarily – spoiling nice Hamlet, say

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A clue to NELSON / PRINCE (Right & Left).
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.Using a dash instead of "for" preserves the wordplay but spoils the surface. And shouldn't it be a letter of thanks?