However tense, start to share ideas (8)
I believe the answer is:
thoughts
'ideas' is the definition.
('thought' can be a synonym of 'idea')
'however tense start to share' is the wordplay.
'however' becomes 'though' (synonyms).
'tense' becomes 't' (abbreviation used in many dictionaries).
'start to' says to take the initial letters.
The initial letter of 'share' is 's'.
'though'+'t'+'s'='THOUGHTS'
(Other definitions for thoughts that I've seen before include "Ideas and opinions (8)" , "Ideas, musings" , "Notions" , "Ideas, reflections" , "Cogitations" .)