Recurring at uniform intervals (7)
I believe the answer is:
regular
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">recurring at uniform intervals</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for regular that I've seen before include "'Steady, uniform (7)'" , "Career soldier" , "Happening frequently" , "Routine" , "Normal or symmetrical" .)