President has soldiers once more out of India (6)
I believe the answer is:
reagan
'president' is the definition.
(Ronald Reagan)
'soldiers once more out of india' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'once more' becomes 'again' (synonyms).
'out of' indicates named letters should be taken away.
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'again' with 'i' removed is 'agan'.
're'+'agan'='REAGAN'
'has' is the link.
(Other definitions for reagan that I've seen before include "Ronald, former American president" , "head of state" , "US president, 1981-89" , "leading actor, once?" , "Ronald ...... ex-American president" .)