Indefinitely many (7)
I believe the answer is:
umpteen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">indefinitely many</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for umpteen that I've seen before include "Guarded" , "Indefinitely large number" , "Informally, very many" , "Large but indefinite number" , "Quite a lot of (sl)" .)