Prop essentially practises his sport in street (5)

I believe the answer is:
strut
'prop' is the definition.
(I've seen this before)
'essentially practises his sport in street' is the wordplay.
'essentially' means to look at the middle letters.
'his sport' becomes 'ru' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'street' becomes 'st' (abbreviation).
The centre of 'practises' is 't'.
't'+'ru'='tru'
'tru' inserted inside 'st' is 'STRUT'.
Can you help me to learn more?
(Other definitions for strut that I've seen before include "Walk proudly; brace" , "Walk with proud and conceited gait" , "Prop; prance" , "swaggering gait" , "Vain walk" .)
