Crossword Genius

Growth in infancy, steady (4)

Ross

I believe the answer is:

cyst

'growth' is the definition.
(I've seen this before)

'in infancy steady' is the wordplay.
'in' indicates a hidden word.
'CYST' is hidden within 'infancy steady'.

(Other definitions for cyst that I've seen before include "Sac or vesicle" , "Abnormal membranous sac" , "Fluid filled sac" , "Membrane" , "Small sac in body (that may form abnormal lump)" .)

I've seen this clue in The Telegraph.
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