Bachelor imprisoned in a tower gets out (6)
I believe the answer is:
abloom
'out' is the definition.
(I've seen this before)
'bachelor imprisoned in a tower' is the wordplay.
'bachelor' becomes 'b' (abbreviation e.g. BA=Bachelor of Arts).
'imprisoned in' indicates putting letters inside.
'tower' becomes 'loom' ('loom' can be a synonym of 'tower').
'a'+'loom'='aloom'
'b' going into 'aloom' is 'ABLOOM'.
'gets' acts as a link.
(Other definitions for abloom that I've seen before include "Healthy" , "Flowering" , "Flourishing" , "In flower" , "covered in flowers?" .)