Teehee, pastille.
Sylvia Plath was the sour-spirited, suicidal American poet who married Ted Hughes and lived (and died) in England. She often expressed horror of natural phenomena like, say, childbirth. 'The Colossus' was one of her earlier sour-spirited poems.
Malignant spirit- what enveloped Plath after first contraction, recalling 'The Colossus' (10)
Malignant spirit: IMP
what enveloped Plath(,) after first (D)RESS
contraction: I'VE
recalling (')The Colossus('): suggesting grandness, IMPRESSIVE