Henry feeding daughter diet that’s immortal? (9)
I believe the answer is:
deathless
'immortal?' is the definition.
(similar in meaning)
'henry feeding daughter diet' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'feeding' indicates putting letters inside (one word is fed by another set of letters).
'daughter' becomes 'd' (genealogical abbreviation).
'diet' becomes 'eatless' (I've seen this in another clue).
'd'+'eatless'='deatless'
'h' inserted inside 'deatless' is 'DEATHLESS'.
'that's' is the link.
(Other definitions for deathless that I've seen before include "living forever" , "Lest heads, oddly, become everlasting" , "Never-ending" , "immortal" .)