Like this, be right and sensible (5)
I believe the answer is:
sober
'sensible' is the definition.
(sober can mean sensible or level-headed)
'like this be right' is the wordplay.
'like this' becomes 'so' ('like so').
'right' becomes 'r' (common abbreviation).
'so'+'be'+'r'='SOBER'
'and' acts as a link.
(Other definitions for sober that I've seen before include "not moved" , "Unfuddled" , "On the wagon" , "In control of one's faculties" , "Judge said to be so" .)