Physician vacated internship -- wimp! (4)
I believe the answer is:
drip
'wimp' is the definition.
(I've seen this before)
'physician vacated internship' is the wordplay.
'physician' becomes 'dr' ('Dr' can be a synonym of 'physician').
'vacated' suggests removing the centre.
'internship' with its middle removed is 'ip'.
'dr'+'ip'='DRIP'
(Other definitions for drip that I've seen before include "Weak and pathetic person" , "Fall as from leaky tap" , "Ineffectual type" , "Ineffectual person; hospital apparatus" , "Fall in small drops as from tap" .)