Within reach entrance is bolted oddly (10)
I believe the answer is:
accessible
'within reach' is the definition.
(thesaurus)
'entrance is bolted oddly' is the wordplay.
'entrance' becomes 'access' (I've seen this before**).
'oddly' indicates alternate letters.
'is'+'bolted'='isbolted'
The alternating letters of 'isbolted' are 'ible'.
'access'+'ible'='ACCESSIBLE'
(Other definitions for accessible that I've seen before include "Open to be got at" , "Approachable; easily understood" , "Easy to talk to; approachable" , "able to be reached" .)