Information about health centre, perhaps - it’s very light (8)
I believe the answer is:
hydrogen
'it's very light' is the definition.
I can't judge whether this defines the answer.
'information about health centre' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'about' says to put letters next to each other.
'health centre' becomes 'hydro' (I can't justify this - if you can you should believe this answer much more).
'gen' put after 'hydro' is 'HYDROGEN'.
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for hydrogen that I've seen before include "Lightest of all gases" , "Light gas" , "Bleach compound" , "Kind of bomb" , "Gas, symbol H" .)