I didn't want to do a SPOILER but here is the clue "One who many know a lot about tents? (9)
I have O-N-P-I-E I know what the word is but can't parse it
The clue is for 14d - One who may know a lot about tents? (9)
I also have the letters O-N-P-I-E The only answer I can find is Oenophile which is a wine lover. Perhaps it is intense?