Heart (4)

'heart' is the definition.
(I know that heart can be written as core)
This is the entire clue.
(Other definitions for core that I've seen before include "Central part of the Earth" , "Planet's centre" , "Central or most important part of something" , "Inmost part" , "Heal" .)
'heart' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for crux that I've seen before include "Most important aspect" , "Vital part of a matter, decisive point" , "Essential point of problem, decision etc" , "Essence or gist" , "Nub" .)
'heart' is the definition.
(I know that heart can be written as middle)
This is all the clue.
(Other definitions for middle that I've seen before include "A fine person" , "Median" , "Equally distant from the extremes" , "One of 21 [HEARTS]" , "Its equally distant from all directions" .)
'heart' is the definition.
(I know that heart can be written as nub)
This is the entire clue.
(Other definitions for nub that I've seen before include "Crux, central point" , "Crux; lump" , "Gist (of a matter)" , "Centre point or core of a matter" , "Crux (of a matter)" .)
(Other definitions for angel that I've seen before include "Person of beauty, purity or kindness?" , "Guardian spirit; theatre investor" , "Top D [DECORATION]" , "Winged messenger" , "lady (very kind)" .)