Decorous or forward? I need to think about that (6)
I believe the answer is:
proper
'decorous' is the definition.
(similar in meaning)
'forward? i need to think about that' is the wordplay.
'forward?' becomes 'prop' (both can mean a rugby player).
'i need to think about that' becomes 'er' (expression of hesitation).
'prop'+'er'='PROPER'
'or' acts as a link.
(Other definitions for proper that I've seen before include "Suitable and correct" , "Appropriate according to rules" , "Fitting and correct" , "Authentic" , "Right or suitable" .)