Platoon I ordered to protect most of bar's inhabitants (10)
I believe the answer is:
population
'inhabitants' is the definition.
(I've seen this before)
'platoon i ordered to protect most of bar's' is the wordplay.
'ordered' indicates an anagram.
'to protect' indicates putting letters inside.
'most of' means to remove the last letter.
'bar' becomes 'pub' (I've seen this before).
'platoon'+'i'='platooni'
'platooni' with letters rearranged gives 'polation'.
'pub' with its last letter removed is 'pu'.
'polation' going around 'pu' is 'POPULATION'.
(Another definition for population that I've seen is " inhabitants".)