Around new hospital, two old boys hang about (6)
I believe the answer is:
hobnob
'hang about' is the definition.
(I've seen this before)
'around new hospital two old boys' is the wordplay.
'two old boys' means two replacements for 'old boy'.
'around' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'hospital' becomes 'h' (abbreviation for hospital on maps).
'old boy' becomes 'ob' (abbreviation).
'old boy' becomes 'ob' (abbreviation).
'h'+'ob'+'ob'='hobob'
'n' going into 'hobob' is 'HOBNOB'.
(Other definitions for hobnob that I've seen before include "Rub shoulders (with)" , "Socialise (especially with posher people)" , "mix informally" , "Hang out with people of standing" , "Socialize, rub elbows with" .)