One’s charged right away from press (3)
I believe the answer is:
ion
'press' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'one's charged right away' is the wordplay.
'one' becomes 'i' (Roman numeral).
'charged' becomes 'torn' ('charge' and 'tear' can both mean run quickly).
'right' becomes 'rt'.
'away' indicates named letters should be taken away.
'torn' with 'rt' taken out is 'on'.
'i'+'on'='ION'
'from' is the link.
(Other definitions for ion that I've seen before include "Subatomic particle" , "Electrically-charged particle" , "Eletrically charged particle" , "Charged atom/molecule" , "Electrically charged atom or group of atoms" .)