Struggled again today, although nothing new – I even remembered ESPALIER!
To train fruit trees — cultivated pears — may take invention (8) = ESPALIER
cultivated = anag. (of pears) invention = LIE
Sharpness of article combined with extremes of emotion (6) = ACUMEN
article = A, combined with = CUM, extremes of emotion = E and N
ESPALIER = to train fruit trees
combined with = CUM