Freeze in reportedly flimsy shelters beside university park (5,2)
I believe the answer is:
tense up
'freeze' is the definition.
(I've seen this in another clue)
'reportedly flimsy shelters beside university park' is the wordplay.
'reportedly flimsy shelters' becomes 'tense' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'beside' means one lot of letters go next to another.
'university' becomes 'U' (abbreviation as in UMass).
'park' becomes 'P' (abbreviation as on an automatic car's gear lever).
'tense'+'u'+'p'='TENSE UP'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tense up that I've seen before include "become edgy" , "Become stiff through stress or anxiety" , "become uneasy" .)