Restraint lifted — good for entering that country (5)
I believe the answer is:
niger
'that country' is the definition.
(African country)
'restraint lifted good for entering' is the wordplay.
'restraint' becomes 'rein' (I've seen this before).
'lifted' is a reversal indicator (going up in down clue).
'good' becomes 'g' (abbreviation).
'for entering' is an insertion indicator.
'rein' backwards is 'nier'.
'nier' going around 'g' is 'NIGER'.
(Other definitions for niger that I've seen before include "W. African country" , "Country W. of Chad" , "foreign banker" , "one flowing through Mali" , "African river flowing into the South Atlantic" .)